-  Philosophy of ‘ Vacuum.’ ( Part 1.)
1.
In beginning was Vacuum an Infinite / Eternal continuum.
2.
Vacuum is not Empty space.
‘ Virtual particles’, ‘ dark matter’ and ‘zoo of elementary particles’
exist in the Vacuum.
3.
Now (!) the physicists think (!) that the Universe as whole has
temperature: T= 2,7K .  The parameter T=2,7K is not constant.
It is temporal and goes down. In the future it will come to T= 0K.
4.
The simplest question: Which geometrical form can have
the ‘ virtual particles’, ‘ the particles of dark matter’ ,
the ‘ zoo of elementary particles’  in reference frame
T= 2,7K - –—> T= 0K ?
The answer is: ‘ They must be flat particles.’
Why?
Because according to Charle’s law and the consequence of the
third law of thermodynamics as the thermodynamic temperature
of a system approaches absolute zero the volume of particles
approaches zero too. It means the particles must have flat forms.
They must have geometrical form of a circle: pi= c /d =3,14 . . . . .
====.
Best wishes.
Israel Sadovnik.  Socratus.
========================…

The physical parameters of Vacuum.
1.
The Vacuum ( as a whole ) is a Homogeneous Space
between Galaxies of the lowest ( the background )
level of temperature: T= 2,7K - –—> T= 0K.
2.
The Vacuum is a Homogeneous Space of the lowest
( the background ) level of Energy: E= 0 ( according to
thermodynamics theory ) or E= ∞ (according to quantum theory) 
3.
The Vacuum is a Homogeneous Space of the lowest
( the background ) level of Energy Density.
===.
WE cannot reach the temperature T=0K and we
cannot reach the energy density of Vacuum.
But just because we cannot reach these Vacuum’s
parameters it does not mean that they don’t exist.
=.
P.S.
If a tree falls in a forest and no one is around to hear it,
does it make a sound?
====.
Socratus.

One comment
Thank you Socratus, for the plain explorable explanation .
a thought/question >>>>>
and if the perfect vacuum did exist what then?
I do not understand what we would get from a perfect vacuum.
  / darkbeaver /

My answer.
Then we have vacuum’s polarization
http://en.wikipedia.org/wiki/Vacuum_polarization

Vacuum Energy Density, or How Can Nothing Weigh Something?
http://www.astro.ucla.edu/~wright/cosmo_constant.html

Conclusion

In the past, we have had only upper limits on the vacuum density and
philosophical arguments based on the Dicke coincidence problem and
Bayesian statistics that suggested that the most likely value
of the vacuum density was zero.

Now we have the supernova data that suggests that the vacuum energy density
is greater than zero. This result is very important if true.
We need to confirm it using other techniques, such as the WMAP satellite
which has observed the anisotropy of the cosmic microwave background
with angular resolution and sensitivity that are sufficient to measure
the vacuum energy density.
CMB data combined with the measured Hubble constant do confirm the
supernova data: there is a positive but small vacuum energy density.
http://www.astro.ucla.edu/~wright/cosmo_constant.html

My opinion.
1.
The vacuum energy density ( as whole) is absolute zero: T=0K
2.
The vacuum energy density can be greater than zero.
/ or How Can Nothing Weigh Something? /
The reason of this increasing can be ` vacuum’s polarization `
==.
socratus

The Models of Vacuum.
1.
A black hole is an idealized physical body ( with a mass of
three - six – ten times more than our Sun ) is a region of
spacetime from which nothing,  not even light, can escape.
2.
A black body is an idealized physical body that can absorb
all incident electromagnetic radiation.

The result: from a ‘black body ‘not even light, can escape’
3.
Max Laue called ‘ Kirchhoff black body’ as ‘ Kirchhoff vacuum’
Why?
Because Vacuum is a space in which there is nothing material.
For example: according to QET then electron interacts
with vacuum he disappeared there. And therefore physicists
invented the mathematical ” method of renormalization”,
a method “to sweep the dust under the carpet” / Feynman./

The result:  from a ‘vacuum ‘not even light, can escape’
#
My conclusion.
The ‘black body’, the ‘ black hole’ and the vacuum
can do one and the same work (completely absorb radiant
energy). It means that the ‘black body’ and the ‘ black hole’
are models of vacuum.

Another fact.
A black hole has a temperature within a few
millionths of a degree above absolute zero: T=0K.
    / Oxford. Dictionary./
And the vacuum has background cosmic temperature:
T= 2.7 K——> T= 0K.
The background cosmic temperature (T= 2.7 K——> T= 0K)
belongs to ‘ The Theory of Ideal Gas’ and therefore we can use
this theory for explaining ‘ The Theory of Vacuum’.

My conclusion.
The ‘black body’ and the ‘ black hole’ and
‘ The Theory of Ideal Gas’ are models of vacuum.
===. 
P.S.
If the ‘black body’ and the ‘ black hole’ and the vacuum can radiate
the quantum of light and electron – then the reason is the Vacuum’s
fluctuations / transformation / polarization. And this is ‘ a song from
another opera’. Because the Vacuum’s fluctuations / transformation /
polarization explains the Origin of the Material Existence.
  ==.
Best wishes.
Israel Sadovnik Socratus
===.

So what is the vacuum?
Answer.
#
‘It might even give us some ground to speculate that
the vacuum itself (and hence the universe) is ‘conscious’.
/ Book ‘The quantum self ’ page 208.  by Danah Zohar. /

#
‘If we were looking for something that we could conceive
of as God within the universe of the new physics, this ground
state, coherent quantum vacuum might be a good place to start.’
/ Book ‘The quantum self ’ page 208.  by Danah Zohar. /
http://en.wikipedia.org/wiki/Danah_Zohar

================.

Book ‘Dreams of a final theory’. By Steven Weinberg.
Page 66.
‘ Most scientists use quantum mechanics every day in they
working lives without needing to worry about the fundamental
problem of its interpretation.
. . .they do not worry about it. A year or so ago . . . . .
our conversation turned to a young theorist who had been quite
promising as a graduate student and who had then dropped
out of sight. I asked Phil what had interfered with the
ex-student’s research. Phil shook his head sadly and said:
‘ He tried to understand quantum mechanics.’  (!)
#
Book ‘ The trouble with Physics’. By Lee Smolin.
Page V!!
‘ Not that every scientist is a seeker, most are not.’ (!)
#
/ page 329. /
‘Few scientists think about foundational problems,
and even fewer have ideas about them’    (!)
===…

Ce la vie !
====…